I spent the first part of the week at FORTUNE Brainstorm Tech in Aspen, a gathering of leaders and thinkers who seemed--to me, at least--to deliver nonstop insight and surprise for three solid days. (Here's a landing page to our YouTube Channel, which can take you directly to some of these conversations.)

But one of the highlights for me happened to be off-camera: It was a roundtable discussion Tuesday afternoon on the "New Science of Fitness" with former professional cyclist George...